In any `DeltaABC`, prove that `4(bc cos^(2)\'\'A/2+ca cos^(2)\'\'B/2+ab cos^(2)\'\'C/2)=(a+b+c)^(2)`

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In any `DeltaABC`, prove that `4(bc cos^(2)\"\"A/2+ca cos^(2)\"\"B/2+ab cos^(2)\"\"C/2)=(a+b+c)^(2)`
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